Oracle:grouping和rollup

Oracle grouping和rollup简单测试

SQL> select department_id,sum(salary) from employees where department_id in(10,30,90,100) group by department_id order by department_id;
DEPARTMENT_ID SUM(SALARY)
------------- -----------
           10        4400
           30       24900
           90       58000
          100       51608

SQL> select department_id,first_name,sum(salary) from employees where department_id in(10,30,90,100) group by (department_id,first_name) order by department_id;
DEPARTMENT_ID FIRST_NAME           SUM(SALARY)
------------- -------------------- -----------
           10 Jennifer                    4400
           30 Alexander                   3100
           30 Den                        11000
           30 Guy                         2600
           30 Karen                       2500
           30 Shelli                      2900
           30 Sigal                       2800
           90 Lex                        17000
           90 Neena                      17000
           90 Steven                     24000
          100 Daniel                      9000
          100 Ismael                      7700
          100 John                        8200
          100 Jose Manuel                 7800
          100 Luis                        6900
          100 Nancy                      12008
16 rows selected

SQL> select department_id,first_name,sum(salary) from employees where department_id in(10,30,90,100) group by rollup(department_id,first_name) order by department_id;
DEPARTMENT_ID FIRST_NAME           SUM(SALARY)
------------- -------------------- -----------
           10 Jennifer                    4400
           10                             4400
           30 Alexander                   3100
           30 Den                        11000
           30 Guy                         2600
           30 Karen                       2500
           30 Shelli                      2900
           30 Sigal                       2800
           30                            24900
           90 Lex                        17000
           90 Neena                      17000
           90 Steven                     24000
           90                            58000
          100 Daniel                      9000
          100 Ismael                      7700
          100 John                        8200
          100 Jose Manuel                 7800
          100 Luis                        6900
          100 Nancy                      12008
          100                            51608
DEPARTMENT_ID FIRST_NAME           SUM(SALARY)
------------- -------------------- -----------
                                        138908
21 rows selected

SQL> select department_id,grouping(department_id),first_name,grouping(first_name),sum(salary) from employees where department_id in(10,30,90,100) group by rollup(department_id,first_name) order by department_id;
DEPARTMENT_ID GROUPING(DEPARTMENT_ID) FIRST_NAME           GROUPING(FIRST_NAME) SUM(SALARY)
------------- ----------------------- -------------------- -------------------- -----------
           10                       0 Jennifer                                0        4400
           10                       0                                         1        4400
           30                       0 Alexander                               0        3100
           30                       0 Den                                     0       11000
           30                       0 Guy                                     0        2600
           30                       0 Karen                                   0        2500
           30                       0 Shelli                                  0        2900
           30                       0 Sigal                                   0        2800
           30                       0                                         1       24900
           90                       0 Lex                                     0       17000
           90                       0 Neena                                   0       17000
           90                       0 Steven                                  0       24000
           90                       0                                         1       58000
          100                       0 Daniel                                  0        9000
          100                       0 Ismael                                  0        7700
          100                       0 John                                    0        8200
          100                       0 Jose Manuel                             0        7800
          100                       0 Luis                                    0        6900
          100                       0 Nancy                                   0       12008
          100                       0                                         1       51608
DEPARTMENT_ID GROUPING(DEPARTMENT_ID) FIRST_NAME           GROUPING(FIRST_NAME) SUM(SALARY)
------------- ----------------------- -------------------- -------------------- -----------
                                    1                                         1      138908
21 rows selected

rollup为按分组统计小计和。
grouping(department_id)和grouping(first_name)
如果当前列所在的行为空，则显示为1，不为空则显示为0；